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Comparison of slurry and dry erosion behaviour of some HVOF thermal sprayed coatings

机译:某些HVOF热喷涂涂料的浆液和干腐蚀行为的比较。

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The performance of 10 high velocity oxy-fuel (HVOF) sprayed coatings has been evaluated under both dry particle and slurry erosion conditions at 90 deg and 20 deg impingement angles. The coatings were six WC cermets with Co- or Ni-based matrices, a Cr_3C_2-NiCr composite and three metallic alloys. Slurry jet erosion experiments were carried out using a 9 wt.precent alumina/water slurry with 35 and 200 #mu#m angular alumina particles, at an impingement velocity of 15 m/s and flow rate of 18 1/min in a re-circulating loop apparatus. Dry erosion was effected in a once-through mode with 50 #mu#m diameter alumina particles at a velocity of 84 m/s and feed rate of 2 g/min. Dry erosion rates three orders of magnitude greater than slurry erosion rates were due mainly to the differences in actual particle-target impact velocities. Coating composition, microstructural integrity and hardness were the major determinants of relative erosion resistance in all tests, with matrix corrosion resistance influencing the surface damage resistance of cermets in longer duration aqueous slurry tests.
机译:已经在90度和20度的撞击角下,在干粉和泥浆侵蚀条件下,对10种高速氧-燃料(HVOF)喷涂涂料的性能进行了评估。涂层是六种带有Co或Ni基基体的WC金属陶瓷,Cr_3C_2-NiCr复合材料和三种金属合金。浆料喷射侵蚀实验是使用9 wt。%的氧化铝/水浆料以及35和200#μ#m的角氧化铝颗粒进行的,其撞击速度为15 m / s,流速为18 1 / min,再次循环回路装置。用直径为50#μm的氧化铝颗粒以84m / s的速度和2g / min的进料速率以一次通过模式进行干法腐蚀。干腐蚀速率比泥浆腐蚀速率大三个数量级,这主要是由于实际的颗粒目标撞击速度不同所致。在所有测试中,涂层成分,微观结构完整性和硬度是决定相对耐蚀性的主要因素,而在较长时间的水浆测试中,耐基体腐蚀性能会影响金属陶瓷的表面抗破坏性。

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